assistant: turn on voice match

Bug: 120666177
Test: locally build and see voice model retraining works.
Change-Id: Ieaff9f11cb1e879a65064001d5455b6f2d325f22
Reviewed-on: https://chromium-review.googlesource.com/c/1423659Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625351}

chromeos/services/assistant/public/features.cc

@@ -11,7 +11,7 @@ namespace assistant {
 namespace features {
 
 const base::Feature kAssistantVoiceMatch{"AssistantVoiceMatch",
-                                         base::FEATURE_DISABLED_BY_DEFAULT};
+                                         base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kAssistantWarmerWelcomeFeature{
     "AssistantWarmerWelcome", base::FEATURE_ENABLED_BY_DEFAULT};